RF31 Hope Microelectronics co., Ltd, RF31 Datasheet - Page 41

• Manufacturer Part Number: RF31
• Description: Rf31 Ism Receiver
• Manufacturer: Hope Microelectronics co., Ltd

The clock recovery oversampling rate is set via rxosr[10:0] in "Register 20h. Clock Recovery Oversampling Rate"
and "Register 21h. Clock Recovery Offset 2".
ndec_exp and dwn3_bypass together with the receive data rate (Rb) are used to calculate rxosr:
Where: Rb is in kbps and enmanch is the Manchester Coding parameter. The resulting rxdr[10:0] value should be
rounded to an integer hexadecimal number.
The clock recovery offset ncoff[19:0] in "Register 21h. Clock Recovery Offset 2", "Register 22h. Clock Recovery
Offset 1", and "Register 23h. Clock Recovery Offset 0" is calculated as follows:
Where: Rb is in kbps.
The clock recovery gain crgain[10:0] in "Register 24h. Clock Recovery Timing Loop Gain 1" and "Register 25h.
Clock Recovery Timing Loop Gain 0" is calculated as follows:
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ncoff =
rxosr =
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Min
40
Rb(1+ enmanch) [kbps]
0
1
2
3
8
Table 18. ndec[2:0] Settings
Rb×（1+enmanch
2
crgain = 2+
ndec_exp-3
500×(1+2×dwn3_bypass)
500×(1+2×dwn3_bypass)
×Rb×（1+enmanch
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Max
rxosr
40
65
2
1
2
3
8
）
16
×2
20+ndec_exp
）
ndec[2:0]
5
4
3
2
1
0
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R F 3 1
41